Well, I guess it's a bad idea after all but I'll step out and put my two cents into this discussion. Oh I know I will be flamed...
First, price has never been a problem. You can make it a billion but in the end it will only result in a few more days to do trading runs. In a long run increasing price doesn't solve anything, just more traders stacking in docking ring of Harris.
Secondly, loosing a battleship isn't a problem - respawn and go on. You can loose a fighter, a bomber, even a gunboat, those are relatively cheap to made and produced in massive numbers, but battleships are quite unique and should be very expensive to produce and repair. What I'm trying to say is that there is no penalty for loosing a battleship, you just respawn and go on as if your precious behemoth didn't take a scratch. I think it's not the price that should be increased but some penalty for loosing a battleship. Right now people aren't afraid of sending their battleships just anywhere, and why should they if all they are going to get is to respawn back the last docking location, and there'll be no loss at all. I do not know yet how exactly this idea should be implemented but I think it's worth to think about it and perhaps find some way. A fighter is a minor loss, there are full hangars of those around, but a battleship is a major strategic loss.